Ecosystem susceptibility to invasion by nonnative species
is poorly understood, but evidence is increasing that spatial
and temporal variability in resources has large-scale effects.
We conducted a study in Artemisia tridentata ecosystems at two
Great Basin locations examining differences in resource availability
and invasibility of Bromus tectorum over elevation gradients
and in response to direct and interacting effects of removal
of perennial herbaceous vegetation and fire. We monitored environmental
conditions, soil variables, and B. tectorum establishment and
reproduction over two years.